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| | Abstract | | Strong ground motions for a period of 2 to 3 seconds were observed in the Ashigara Valley during the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0). Especially, pseudo velocity response (h=5%) for a period of 3 seconds is over 200 cm/sec at the central part (NRD107) in the Ashigara Valley. In this study, we evaluated the strong ground motion in this site, by the multi-reflection method using the previous S-wave velocity structural model. The velocity at the bed rock (Vs 2.8km/sec) calculated using recording data on the surface of NRD107 reproduced well the velocity observed at borehole of the rock site. |
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